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• use ffmpeg.exe in Webservice hosted on Android

  24 novembre 2016, par ikazzaz

  I want to use ffmpeg with a Webservice hosted on Android. I include the "ffmpeg.exe" in "myservice.war" package and deploy it on i-jetty server. Problem I get is that "ffmpeg.exe" is not found when calling the service that runs ffmpeg command !!
  Any ideas why/how to solve this problem ? Thank you !

• FFMPEG using wrong arguements when refering to image files

  14 août 2013, par Chad Marmon

  I am creating a bat file that will use FFMPEG to convert Real Media files to .MP4 files. I am looping though the current folder and finding files with the .rm extension adding several pictures to the video files to create a slide show effect in the final product.

  With this code here it works except it only shows one static image :

  for %%a in ("*.rm") do ffmpeg -f image2 -r 1/5 -i "img00.jpg" -i "%%a" -c:v libx264 -r 30 -preset slow -crf 20 -c:a libvo_aacenc -b:a 48k -b:v 16k "newfiles\%%~na.mp4"

  With this code it should show a series of photos. However it does not :

  for %%a in ("*.rm") do ffmpeg -f image2 -r 1/5 -i "img%02d.jpg" -i "%%a" -c:v libx264 -r 30 -preset slow -crf 20 -c:a libvo_aacenc -b:a 48k -b:v 16k "newfiles\%%~na.mp4"

  I get this error when I run the second piece of code :

  Could find no file with with path 'imgC :\Data\RealtoMP\FFMPEG_JPG\ffmpegA48V16_AudOnly' and index in the range 0-4
  imgC :\Data\RealtoMP\FFMPEG_JPG\ffmpegA48V16_AudOnly : No such file or directory

  It appears to me that it is somehow instead of getting the range argument like it should, it's injecting the path to the file that I am running. Any ideas of what is causing this ?

  EDIT :

  I fixed my problem by escaping the %02 with another %. The result is %%02 for it to act correctly in the script.

• Thread safety of FFmpeg when using av_lockmgr_register

  12 août 2013, par Stocastico

  My application uses FFmpeg to read video streams. So far, I ensured thread safety by defining my own global lock and looking for all the methods inside FFmpeg libraries which are not thread safe.
  This makes the code a bit messy, so while looking for better ideas I found this answer, but apparently I couldn't make use of the suggestions.
  I tried testing it in my own environment, but I always get critical heap error. Here's the test code

  class TestReader
  
  {
  
  public:
  
   TestReader( std::string sVid )
  
   {
  
     m_sVid = sVid;
  
     m_cVidPtr.reset( new VideoReader() );
  
   }
  
  
  
   ~TestReader()
  
   {}
  
  
  
   void operator() ()
  
   {
  
      readVideoThread();
  
   }
  
  
  
   private:
  
   int readVideoThread()
  
   {
  
     m_cVidPtr->init( m_sVid.c_str() );
  
     MPEGFrame::pointer cFramePtr;
  
  
  
     for ( int i=0; i< 500; i++ )
  
     {
  
       cFramePtr = m_cVidPtr->getNextFrame();
  
     }
  
  
  
     return 0;
  
   }
  
   boost::shared_ptr<videoreader> m_cVidPtr;
  
   std::string m_sVid;
  
  };
  
  
  
  /*****************************************************************************/
  
  int lockMgrCallback(void** cMutex, enum AVLockOp op)
  
  {
  
   if (nullptr == cMutex)
  
     return -1;
  
  
  
   switch(op)
  
   {
  
   case AV_LOCK_CREATE:
  
     {
  
       *cMutex = nullptr;
  
       boost::mutex* m = new boost::mutex();
  
       *cMutex = static_cast(m);
  
       break;
  
     }
  
   case AV_LOCK_OBTAIN:
  
     {
  
       boost::mutex* m =  static_cast(*cMutex);
  
       m->lock();
  
       break;
  
     }
  
   case AV_LOCK_RELEASE:
  
     {
  
       boost::mutex * m = static_cast(*cMutex);
  
       m->unlock();
  
       break;
  
     }
  
   case AV_LOCK_DESTROY:
  
     {
  
       boost::mutex * m = static_cast(*cMutex);
  
       delete m;
  
       break;
  
     }
  
   default:
  
     break;
  
   }
  
   return 0;
  
  }
  
  
  
  int testFFmpegMultiThread( std::string sVideo )
  
  {
  
   if ( ::av_lockmgr_register( &amp;lockMgrCallback ) )
  
   {
  
     std::cout &lt;&lt; "Could not initialize lock manager!" &lt;&lt; std::endl;
  
     return -1;
  
   }
  
   TestReader c1(sVideo);
  
   TestReader c2(sVideo);
  
   boost::thread t1( c1 );
  
   boost::thread t2( c2 );
  
  
  
   t1.join();
  
   t2.join();
  
  
  
   return 0;
  
  }
  
  </videoreader>

  The classes VideoReader and MPEGFrame are just wrappers and have always worked perfectly in single threaded scenarios, or in multi-threaded scenario managed using my own global lock.
  Am I missing something obvious ? Can anybody point me to some working code ? Thanks in advance